When receiving an order from Amazon, most people throw way the packaging box immediately, but one Japanese man loves Amazon boxes so much that he has spent the last 9 years collecting them.

So what posses a man to start collecting Amazon cardboard boxes? In the case of Kosuke Saito, from Osaka, Japan, it was the discovery of a pattern of numbers. It all started one day, in 2008, when, while unpacking an Amazon product, he noticed the serial number “XM06” on the packaging and remembered seeing “XM08” on another Amazon box. That got him thinking that if there was an XM06 and an XM08, surely there must be an XM07 as well. He wanted to know what that box was like, but it was only the beginning, because he soon discovered that Amazon boxes come in all shapes and sizes, and he was curious about all of them.

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